8. Basic aerodynamics - Q&A
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Stall inducers may be fitted to a wing
- at the root to cause the root to stall first.
- at the tip to cause the root to stall first.
- at the root to cause the tip to stall first.
any help guys?
The maximum lift/drag ratio of a wing occurs
- at the angle of attack producing maximum total lift.
- during the take off ground roll.
- at an angle below which the wing develops max lift.
Can someone explain please?
With the ailerons away from the neutral, induced drag is
- higher on the lower wing plus profile drag also increases.
- unchanged but the profile drag is somewhat higher.
- higher on the upper wing plus profile drag increases.
Please write your question here.
In normal flight conditions, an increase in aircraft speed
- causes the nose of the aircraft to drop.
- causes the nose of the aircraft to lift.
- the nose remains in the same position.
Why?
A centre of gravity position close to its aft limit will cause the aircraft to
- pitch nose down and increase its longitudinal stability.
- pitch nose up and decrease its longitudinal stability.
- pitch nose up and increase its longitudinal stability.
can someone explain please?
What happens to air flowing at the speed of sound when it enters a converging duct?
- Velocity increases, pressure and density decreases.
- Velocity, pressure and density increase.
- Velocity decreases, pressure and density increase.
Why?
If you have an aircraft that is more laterally stable then directionally stable it will tend to
- bank.
- slip.
- skid.
Why?
Induced Drag is
- never equal to profile drag.
- equal to profile drag at Vmd.
- equal to profile drag at stalling angle.
Can someone please tell me what is Vmd?
On a high winged aircraft, what effect will the fuselage have on the up-going wing?
- The up-going wing will have a decrease in angle of attack and therefore a decrease in lift.
- The down-going will have a decrease in angle of attack and therefore a decrease in lift.
- The up-going wing will have an increase in angle of attack and therefore a decrease in lift.
can someone please explain this?I thought it was c
Airflow over the upper surface of the wing generally
- flows toward the tip.
- flows towards the root.
- flows chordwise from leading to trailing edge.
why not towards the tip?
Lift is generated by a wing
- mostly on the bottom surface.
- mostly on the top surface.
- equally on both the top and bottom surfaces.
why is it mostly on the top and not on the bottom?Shouldn't it be the bottom?
An anti-balance tab is used
- to relieve hinge loads on the controls.
- for trimming the aircraft during cruise flight.
- to give more feel to the controls.
i dont understand should i learn it by heart?
What is the collective term for the fin and rudder and other surfaces aft of the centre of gravity that helps directional stability?
- Empennage and vertical stabiliser.
- Forward fuselage keel area.
- Effective keel surface.
why not empennage?I got really confused with this question.
Before an aircraft reaches critical mach
- the nose pitches up because the CP moves Forward.
- the aircraft buffets because the CP moves to the shock wave.
- the nose pitches down because the CP moves rear.
why CP moves rear?
The reason for sharp leading edged wings on high speed aircraft is to
- enable the shockwave to be accurately positioned.
- enable the shockwave to be pushed aft and reduce wave drag.
- reduce the laminar boundary layer thickness on the wing surface.
Please explain
The atmospheric zone where the temperature remains fairly constant is called the
- stratosphere.
- ionosphere.
- troposphere.
Please explain
To overcome ineffective control surface problems in the transonic region
- an all moving tailplane may be used.
- hydraulically boosted elevators may be used.
- Frise type ailerons may be fitted instead.
Please explain
Upward and outward inclination of a mainplane is termed
- dihedral.
- sweep.
- stagger.
but dihedral is not only for the wings? mainplane is the airplane not the wings... please explain me.
Tuck-under is caused by
- tip stall on a straight wing aircraft.
- tip stall on a swept wing aircraft.
- root stall on a swept wing aircraft.
what is tuck-under?
An aircraft, which is longitudinally stable, will tend to return to level flight after a movement about which axis?
- Pitch.
- Roll.
- Yaw.
longitudinal axis = roll
lateral axis = pitch
???
In a turn the up-going wing causes a
- de-stabilizing effect due to increased AoA.
- de-stabilizing effect due to decreased AoA.
- stabilizing effect due to decreased AoA.
Why the aoa decrease?
In a bank, the weight is
- increased.
- decreased.
- unchanged.
Why?
What happens to load factor as you decrease turn radius?
- It increases.
- It decreases.
- It stays constant.
Why?
What happens to load factor as you decrease turn radius?
- It increases.
- It decreases.
- It stays constant.
Why?
The difference between transient droop and static droop is
- overswing.
- underswing.
- a hole in one.
Can anyone tell me what are transient droop and static droop?